I use the pro trim, aardvark and scissors.
as mentioned by other posters, when you you have a big harvest scissors just won't cut it(no pun intended!) and you have to go to the pro trim, aardvark or the commercial tumblers as someone posted a youtube link to.
The tumblers are expensive, but if you bought one for $20k it would pay for itself in one season. It's risky and tiring having 20 trimmers on your property for weeks/months, so the tumbler has some merit.
No doubt the pro trim and aardvark do the most damage to the buds. Spinning blades and fan suction beating up your nice buds and sucking trichromes off!
The way the aardvark works is you attach it to the end of a vacuum- a decent sized shop vac is preffered. the end attachment has a small slit and within it there are spinning blades. You simply run the aardvark up and down the bud and you rotate the bud around in your hand.
The pro trimmer is a standup unit and it's best to sit on a higher chair or a telescoping computer chair type. Anyways, it's about a 2 ft sq top with slits all over the top of it. underneath is a spinning blade. Here's an example....... u go out to your (outdoor) garden and start cutting branches off the plant. no longer than 3' i'd say. Do a quick big leaf by hand then you turn the pro tim on and roll the branch all over the top and the blade cuts off leaf and collects it in a bag underneath the blade. then it goes to the aardvark, then you dry it, then do a quick touch up trim by hand.
the whole process goes like this.....
cut branches off plant
big leaf
pro trim
aardvark
dry the buds
finally you hand trim, basically touching up what the machines missed. you can easily do a pound in 15mins. at this point. And i know alot of ppl that don't hand trim at the end. it's basically a commercial grow- grow it and get it out the door. pay me and i'm on vacation for the winter, see ya next spring! lol but me, i put more care into it. i grow organically and as much as i hate the pro trim and aardvark, it's just necessary when u take alot down at once.